Porting Calculator V4.2.2 (Must See)

Enter a target timing (e.g., 185° exhaust for high RPM) to see exactly how many millimeters you need to raise the port roof.

The original V4.2.2 may use long double (80-bit x86 extended precision). Modern compilers default to 64-bit double on ARM or x86_64 with -mfpmath=sse . Compile with -mfpmath=387 -mno-sse on x86, or use __float128 with explicit rounding. Porting Calculator V4.2.2